this blows up at the method invocation [super.position = position is fine]

gistfile1.txt

- (void)setPosition:(CGPoint)position {
    if (self.isInPlasma){
        _CCSpriteSetPositionMethod = class_getInstanceMethod([CCSprite class], @selector(setPosition:));

        ((void(*)(id, SEL, CGPoint))_CCSpriteSetPositionMethod)(self, @selector(setPosition:), ccp(position.x, position.y- 100));
    } else {
        super.position = position;
    }
}